auth03.dns.true.nl has no CNAME records.
Question and response
Question
dig auth03.dns.true.nl. NS
Answer
The response has no answer records.
Authority
true.nl. 5859 SOA auth01.dns.trueserver.nl. hostmaster.true.nl. 2024052764 86400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0